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# SPDX-License-Identifier: GPL-3.0+
# Copyright (C) 2020 Nayil Mukhametshin
# Calculate keys and decrypt encrypted firmware packages.
import hashlib
import xml.etree.ElementTree as ET
from Crypto.Cipher import AES
from clint.textui import progress
from . import request
from . import fusclient
from . import versionfetch
unpad = lambda d: d[:-d[-1]]
def getv4key(version, model, region):
client = fusclient.FUSClient()
req = request.binaryinform(version, region, model, client.nonce)
resp = client.makereq("NF_DownloadBinaryInform.do", req)
root = ET.fromstring(resp)
logicval = root.find("./FUSBody/Put/LOGIC_VALUE_FACTORY/Data").text
deckey = request.getlogiccheck(version, logicval)
return hashlib.md5(deckey.encode()).digest()
def getv2key(version, model, region):
deckey = region + ":" + model + ":" + version
return hashlib.md5(deckey.encode()).digest()
def decrypt_progress(inf, outf, key, length):
cipher = AES.new(key, AES.MODE_ECB)
assert length % 16 == 0
chunks = length//4096+1
for i in progress.bar(range(chunks)):
block = inf.read(4096)
if not block:
break
decblock = cipher.decrypt(block)
if i == chunks - 1:
outf.write(unpad(decblock))
else:
outf.write(decblock)
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